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synchrocyclotron beam orbit and rf driven synchrocyclotron

A cyclotron and speed technology, applied in the direction of magnetic resonance accelerators, accelerators, electrical components, etc., can solve problems such as limited opportunities

Inactive Publication Date: 2017-10-10
MASSACHUSETTS INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But for extraction, the opportunities are very limited

Method used

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  • synchrocyclotron beam orbit and rf driven synchrocyclotron

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[0031] In order to determine beam position and to optimally accelerate, inject and extract ions, it is desirable to synchronize the phase of the RF drive to the phase of the ion beam orbit and to adjust the amplitude of the RF field. The steps used for synchronization are described later. The phase of the RF drive, while fixed at the source, varies across the gap (which is defined as the spacing across the dee of the device) due to the finite propagation velocity of electromagnetic waves and because the accelerating gap may not be the radial directional (such as an acceleration gap that changes azimuth direction as a function of radius). The D-box is used to generate the RF-driven electrodes. While the term "D-box" may be used herein, it should be understood that this term refers to any mechanism that can be used to inject RF drive into the system. In some embodiments, an alternative to using a D-box is to use an RF cavity. Therefore, unless otherwise indicated, the term "D...

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Abstract

The present invention provides for the use of feedback in the radio frequency (RF) drive of a synchrocyclotron to control the phase and / or amplitude of the accelerating field as a means of ensuring optimal acceleration of the beam, increasing the average beam current, and modifying the beam trajectory to follow Variations in beam energy allow proper extraction. Space charge effects are reduced by rapid acceleration and extraction of the beam, and the pulse repetition rate can be increased. Several measures have been proposed for monitoring the phase of the beam in a synchrocyclotron and adjusting the phase and amplitude of the RF in order to optimize the acceleration of the beam and adjust the extraction and injection of the beam. Also described is the use of a pulsed ion source matched to the acceptance window of the synchrocyclotron.

Description

[0001] This application claims priority to U.S. Provisional Application Serial No. 61 / 676,377, filed July 27, 2012, and U.S. Patent Application Serial No. 13 / 949,459, filed July 24, 2013, the disclosures of which are incorporated herein by reference Its entirety is incorporated here. Background technique [0002] Ion acceleration using a synchrocyclotron is a well-established technology that is well suited for producing high energies but relatively low average ion beam currents. Acceleration is achieved by applying a high frequency (usually radio frequency (RF)) electric field to the ion beam packet as it spirals outward from the center of an axisymmetric static magnetic field. It is well known that the frequency of the RF drive in a synchrocyclotron needs to be adjusted as the ion beam is accelerated. The RF drive can be extended to include a variable frequency RF generator, one or more RF power amplifiers, and one or more structures inside the magnetic field (such as an RF ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05H13/00
CPCH05H7/10H05H13/005H05H13/02H05H7/02H05H2007/025
Inventor L.布隆伯格J.V.米纳维尼A.L.拉多文斯基P.C.迈克尔
Owner MASSACHUSETTS INST OF TECH
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